The Speedlite 550EX is a high-performance external flash unit designed for Canon EOS film and digital SLR cameras. Offering advanced features and versatile functionality, this flash provides photographers with additional lighting options to enhance their creative possibilities. With its powerful output, fast recycling times, and wireless flash capabilities, the Speedlite 550EX is suitable for a wide range of photography genres, including portraits, events, and studio photography. Product Features: Guide Number of 55m/180 ft. (ISO 100, at 105mm focal length), providing ample light output for various shooting conditions. Zoom flash head covers a focal length range from 24mm to 105mm, with auto zoom and manual zoom options for precise control over light spread. Swivel and tilt flash head for bounce flash photography, allowing for soft, natural-looking lighting and reduced harsh shadows. Built-in wireless flash capability for off-camera flash setups, enabling creative lighting effects and multiple flash setups. E-TTL (Evaluative Through-The-Lens) flash metering system for accurate and consistent flash exposures. High-speed sync (HSS) mode for synchronizing flash with high shutter speeds, ideal for outdoor and daylight fill-flash photography. Manual flash mode with adjustable power settings for full control over flash output. Flash exposure compensation and flash exposure bracketing for fine-tuning flash exposures. Custom functions for personalized flash control and customization. Compatible with a wide range of Canon EOS film and digital SLR cameras. Condition: Used, Good Condition What's Included: Speedlite 550EX flash unit